250 lines
7.0 KiB
C
250 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* AD7606 Parallel Interface ADC driver
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*
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* Copyright 2011 - 2024 Analog Devices Inc.
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* Copyright 2024 BayLibre SAS.
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*/
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/types.h>
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#include <linux/iio/backend.h>
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#include <linux/iio/iio.h>
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#include "ad7606.h"
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static const struct iio_chan_spec ad7606b_bi_channels[] = {
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AD7606_BI_CHANNEL(0),
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AD7606_BI_CHANNEL(1),
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AD7606_BI_CHANNEL(2),
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AD7606_BI_CHANNEL(3),
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AD7606_BI_CHANNEL(4),
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AD7606_BI_CHANNEL(5),
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AD7606_BI_CHANNEL(6),
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AD7606_BI_CHANNEL(7),
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};
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static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask)
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{
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struct ad7606_state *st = iio_priv(indio_dev);
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unsigned int c, ret;
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for (c = 0; c < indio_dev->num_channels; c++) {
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if (test_bit(c, scan_mask))
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ret = iio_backend_chan_enable(st->back, c);
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else
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ret = iio_backend_chan_disable(st->back, c);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio_dev)
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{
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struct ad7606_state *st = iio_priv(indio_dev);
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unsigned int ret, c;
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struct iio_backend_data_fmt data = {
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.sign_extend = true,
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.enable = true,
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};
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st->back = devm_iio_backend_get(dev, NULL);
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if (IS_ERR(st->back))
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return PTR_ERR(st->back);
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/* If the device is iio_backend powered the PWM is mandatory */
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if (!st->cnvst_pwm)
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return dev_err_probe(st->dev, -EINVAL,
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"A PWM is mandatory when using backend.\n");
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ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev);
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if (ret)
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return ret;
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ret = devm_iio_backend_enable(dev, st->back);
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if (ret)
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return ret;
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for (c = 0; c < indio_dev->num_channels; c++) {
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ret = iio_backend_data_format_set(st->back, c, &data);
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if (ret)
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return ret;
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}
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indio_dev->channels = ad7606b_bi_channels;
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indio_dev->num_channels = 8;
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_bi_bops = {
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.iio_backend_config = ad7606_bi_setup_iio_backend,
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.update_scan_mode = ad7606_bi_update_scan_mode,
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};
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static int ad7606_par16_read_block(struct device *dev,
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int count, void *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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/*
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* On the parallel interface, the frstdata signal is set to high while
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* and after reading the sample of the first channel and low for all
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* other channels. This can be used to check that the incoming data is
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* correctly aligned. During normal operation the data should never
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* become unaligned, but some glitch or electrostatic discharge might
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* cause an extra read or clock cycle. Monitoring the frstdata signal
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* allows to recover from such failure situations.
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*/
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int num = count;
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u16 *_buf = buf;
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if (st->gpio_frstdata) {
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insw((unsigned long)st->base_address, _buf, 1);
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if (!gpiod_get_value(st->gpio_frstdata)) {
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ad7606_reset(st);
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return -EIO;
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}
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_buf++;
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num--;
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}
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insw((unsigned long)st->base_address, _buf, num);
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_par16_bops = {
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.read_block = ad7606_par16_read_block,
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};
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static int ad7606_par8_read_block(struct device *dev,
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int count, void *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad7606_state *st = iio_priv(indio_dev);
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/*
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* On the parallel interface, the frstdata signal is set to high while
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* and after reading the sample of the first channel and low for all
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* other channels. This can be used to check that the incoming data is
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* correctly aligned. During normal operation the data should never
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* become unaligned, but some glitch or electrostatic discharge might
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* cause an extra read or clock cycle. Monitoring the frstdata signal
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* allows to recover from such failure situations.
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*/
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int num = count;
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u16 *_buf = buf;
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if (st->gpio_frstdata) {
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insb((unsigned long)st->base_address, _buf, 2);
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if (!gpiod_get_value(st->gpio_frstdata)) {
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ad7606_reset(st);
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return -EIO;
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}
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_buf++;
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num--;
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}
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insb((unsigned long)st->base_address, _buf, num * 2);
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_par8_bops = {
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.read_block = ad7606_par8_read_block,
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};
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static int ad7606_par_probe(struct platform_device *pdev)
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{
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const struct ad7606_chip_info *chip_info;
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const struct platform_device_id *id;
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struct resource *res;
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void __iomem *addr;
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resource_size_t remap_size;
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int irq;
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/*
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* If a firmware node is available (ACPI or DT), platform_device_id is null
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* and we must use get_match_data.
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*/
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if (dev_fwnode(&pdev->dev)) {
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chip_info = device_get_match_data(&pdev->dev);
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if (device_property_present(&pdev->dev, "io-backends"))
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/*
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* If a backend is available ,call the core probe with backend
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* bops, otherwise use the former bops.
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*/
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return ad7606_probe(&pdev->dev, 0, NULL,
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chip_info,
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&ad7606_bi_bops);
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} else {
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id = platform_get_device_id(pdev);
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chip_info = (const struct ad7606_chip_info *)id->driver_data;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
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if (IS_ERR(addr))
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return PTR_ERR(addr);
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remap_size = resource_size(res);
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return ad7606_probe(&pdev->dev, irq, addr, chip_info,
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remap_size > 1 ? &ad7606_par16_bops :
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&ad7606_par8_bops);
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}
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static const struct platform_device_id ad7606_driver_ids[] = {
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{ .name = "ad7605-4", .driver_data = (kernel_ulong_t)&ad7605_4_info, },
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{ .name = "ad7606-4", .driver_data = (kernel_ulong_t)&ad7606_4_info, },
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{ .name = "ad7606-6", .driver_data = (kernel_ulong_t)&ad7606_6_info, },
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{ .name = "ad7606-8", .driver_data = (kernel_ulong_t)&ad7606_8_info, },
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{ .name = "ad7606b", .driver_data = (kernel_ulong_t)&ad7606b_info, },
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{ .name = "ad7607", .driver_data = (kernel_ulong_t)&ad7607_info, },
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{ .name = "ad7608", .driver_data = (kernel_ulong_t)&ad7608_info, },
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{ .name = "ad7609", .driver_data = (kernel_ulong_t)&ad7609_info, },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
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static const struct of_device_id ad7606_of_match[] = {
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{ .compatible = "adi,ad7605-4", .data = &ad7605_4_info },
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{ .compatible = "adi,ad7606-4", .data = &ad7606_4_info },
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{ .compatible = "adi,ad7606-6", .data = &ad7606_6_info },
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{ .compatible = "adi,ad7606-8", .data = &ad7606_8_info },
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{ .compatible = "adi,ad7606b", .data = &ad7606b_info },
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{ .compatible = "adi,ad7607", .data = &ad7607_info },
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{ .compatible = "adi,ad7608", .data = &ad7608_info },
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{ .compatible = "adi,ad7609", .data = &ad7609_info },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ad7606_of_match);
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static struct platform_driver ad7606_driver = {
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.probe = ad7606_par_probe,
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.id_table = ad7606_driver_ids,
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.driver = {
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.name = "ad7606",
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.pm = AD7606_PM_OPS,
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.of_match_table = ad7606_of_match,
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},
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};
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module_platform_driver(ad7606_driver);
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MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
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MODULE_LICENSE("GPL v2");
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MODULE_IMPORT_NS("IIO_AD7606");
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MODULE_IMPORT_NS("IIO_BACKEND");
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